376 CAPTAIN W. DE W. ABNEY AND DR. T. E. THORPE ON PHOTOMETRIC. 
During the eclipse this lamp was really 21'6 inches from the screen, and, as in the 
former case, the actual values of the light were higher. 
The numbers in the above tables are graphically represented in the following curves, 
from which the results of the observations were measured. 
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Volts 4 
Table III. gives the value in light of the readings on the equatorial photometer. 
The numbers of the grease spots in Column I. correspond with the order in which 
they were read. Column II. gives the calculated distance of each spot from the Sun’s 
centre in terms of the Solar diameter. Column III. gives the readings on the volta¬ 
meter ; and Column IV. the corresponding value of the light in Siemens units. 
Column V. gives the approximate time in seconds after the beginning of totality when 
the several readings were made. 
